Mycobacterial infections in AIDS patients are mostly likely to be caused by ________.
A. Mycobacterium avium complex
B. Mycobacterium africanum
C. Mycobacterium bovis
D. Mycobacterium tuberculosis
Answer: A
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Phagocytes have general antibody receptors called ________ that bind to any antibody attached to an antigen
A) antigens B) antigen receptors C) Fc receptors D) membrane detectors
Imagine that you are on a nature walk. Your guide points out a lichen growing on a tree trunk, and comments that lichens are actually a type of fungi. You know that this description is not correct. Why?
A. Lichens are actually vascular plants that produce hyphae instead of roots. B. Lichens are actually composed of both fungi and green algae (or cyanobacteria). C. Lichens are actually composed of both fungi and bryophytes. D. Lichens are actually bryophytes that produce hyphae instead of roots.
Light reflected by chlorophyll a has a wavelength of approximately _____
1.475 nm
2.500 nm
3.575 nm
4.650 nm
For what purpose is the polymerase chain reaction (PCR) used?
A) to analyze a person's fingerprints B) to separate fragments of DNA C) to make many copies of a small amount of DNA D) to cut DNA into many small pieces